👉 Ventilator is a medical device that helps to remove air from an area of the body. It works by using fans or other devices to move the air through the lungs, allowing it to be breathed in and out. Ventilation is essential for treating patients with respiratory diseases like pneumonia, bronchitis, asthma, and lung infections. In a ventilator, the patient's airway is blocked, so they breathe into a bag that contains oxygen. This oxygen is then transferred to their bloodstream through